Two vertical poles of heights 20 m and 80 m stand apart on a horizontal plane. The height (in meter) of the point of intersection of the lines joining the tops of each pole to the foot of the other, from this horizontal plane is
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Two vertical poles of heights 20 m and 80 m stand apart on a horizontal plane. The height (in meter) of the point of intersection of the lines joining the tops of each pole to the foot of the other, from this horizontal plane is